The subject of qua-theory (in Polish). Diametros, [S. l.], n. 31, p. 113–132, 2012. DOI: 10.13153/diam.31.2012.465. Disponível em: https://diametros.uj.edu.pl/diametros/article/view/465. Acesso em: 6 aug. 2026.